Some standard content:
ICS 31.060.70
Standard of the Machinery Industry of the People's Republic of China
JB/T8168-1999
Pulse capacitors and direct current capacitors1999-08-06 Issued
National Bureau of Machinery Industry
2000-01-01 Implementation
JB/T8168-1999
This standard is a revision of JB/T8168-95 "Pulse capacitors and direct current capacitors". During the revision, the original standard was edited and the main technical content remained unchanged. This standard replaces JB/T8168-95 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Power Capacitors. The drafting units of this standard are: Guilin Power Capacitor General Factory and Xi'an Power Capacitor Research Institute. The main drafters of this standard are: Tang Yunguang and Shen Xiuzhu. This standard was first issued in October 1984 and revised for the first time in August 1992. The National Technical Committee for Standardization of Power Capacitors is responsible for the interpretation of this standard. 220
1 Scope
Machinery Industry Standard of the People's Republic of China
Pulse capacitors and direct current capacitors
Pulse capacitors and direct current capacitorsJB/T8168-1999
Replaces JB/T8168-95
This standard specifies the product classification, technical requirements, test methods, inspection rules and markings of pulse capacitors and direct current capacitors. This standard applies to pulse capacitors and direct current capacitors (hereinafter referred to as capacitors). These capacitors are mainly used for: a) impulse voltage generators, impulse current generators, impulse voltage dividers and other non-continuous pulse devices; b) oscillation circuits, continuous pulse devices;
c) DC high-voltage equipment and rectifier and filter devices. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of the standard, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. GB/T16927.1-1997 High voltage test technology Part 1: General test requirements (eqvIEC60060-1:1989) 3 Definitions
This standard adopts the following definitions.
3.1 Continuous pulse
Discharge shock that occurs repeatedly during the uninterrupted charging and discharging process over a period of time. 3.2 Oscillation circuit
A device composed of capacitors and reactors as the main body, which obtains AC power by oscillating discharge between capacitors and reactors. 3.3 Reverse peak voltage rate
The percentage of the ratio of the first reverse sign amplitude of the voltage wave in the oscillation wave formed during discharge to the previous amplitude. 3.4 Discharge decay rate
The ratio of the amplitudes of two consecutive oscillations of the same sign in the decaying oscillation wave formed during discharge. 3.5 Self-discharge time constant
When a capacitor discharges only through its own insulation resistance, the product of its insulation resistance and the measured capacitance value. 3.6 Intrinsic inductance
The inductance of the conductive system of the capacitor. 3.7 Repetition rate
The number of times a capacitor is charged and discharged per unit time, in units of times/s or times/min. 3.8 Oscillation frequency
The frequency of the voltage (or current) during oscillation discharge, in units of Hz. Approved by the State Bureau of Machinery Industry on August 6, 1999, and implemented on January 1, 2000
4 Product classification
4.1 Installation location
Capacitors are divided into indoor and outdoor types.
4.2 Application
According to the main application, capacitors are divided into:
JB/T 8168-1999
a) Capacitors for impulse voltage, impulse current, impulse voltage divider and other non-continuous pulse devices; b) Capacitors for oscillation circuits and continuous pulse devices; c) Capacitors for DC high-voltage equipment and rectifier filter devices. 4.3 Rated voltage
The rated voltage of the capacitor is recommended to be selected from the following values: 1, 2, 3, 4, 5, 8, 10, 30, 40, 50, 80, 100, 110, 150, 200, 220, 250, 300, 400, 500 kV. The value with a lower horizontal line is the preferred value.
5 Technical requirements
5.1 Usage requirements
5.1.1 Altitude
The altitude of the installation and operation area should not exceed 1000m. 5.1.2 Ambient air temperature
The ambient air temperature in the installation and operation area shall not exceed one of the following ranges: -5℃～+40℃, -25℃～+40℃ or -40℃～+40℃. 5.1.3 Relative humidity
Indoors shall not be greater than 75%; outdoors is allowed to reach 100%. 5.1.4 Chemical conditions
The installation and operation site shall be free of gases and other chemicals that are harmful to metals and insulating materials, and shall not be subject to explosion and flammable hazards. 5.1.5 Mechanical conditions
The installation and operation site and the device shall be free of severe mechanical vibration. 5.2 Structural and performance requirements
5.2.1 Appearance and dimensions
The appearance and dimensions of the capacitor shall comply with the requirements of the product drawings, and the exposed surface of its metal parts shall have a reliable anti-corrosion layer. 5.2.2 Electrical connection
The internal electrical connection of the capacitor shall be firm and reliable. 5.2.3 Sealing performance
The capacitor shall have good sealing performance. 5.2.4 Withstand voltage level
The dielectric between the capacitor terminals should be able to withstand the DC test voltage specified in Table 1 for 1 min. For capacitors whose output terminals are insulated from the casing, the insulation between the output terminals and the casing should be able to withstand the test voltage specified by the manufacturer.
Capacitor
Capacitor for impulse voltage division
Capacitor for impulse voltage
Capacitor for DC high voltage
JB/T 8168-1999
Table 1 Test voltage
Test voltage
Note: Un is the rated voltage of the capacitor, kV5.2.5 Capacitance deviation
Capacitor
Capacitor for impulse current
Capacitor for oscillation circuit
Capacitor for continuous pulse
Capacitor for rectification and filtering
Test voltage
The difference between the measured capacitance of the capacitor and its rated value shall not exceed 5% of the rated value for capacitors for impulse voltage division and 10% of the rated value for others.
5.2.6 Loss tangent
The allowable value of the loss tangent of the capacitor shall be specified by the manufacturer. 5.2.7 Insulation resistance or self-discharge time constant The insulation resistance or self-discharge time constant of capacitors shall comply with the requirements of Table 2 Table 2 Insulation resistance or self-discharge time constant of capacitors Capacitor capacitance μF
5.2.8 Inherent inductance
The inherent inductance value of the capacitor shall be determined by negotiation between the purchaser and the manufacturer 5.2.9 Endurance performance
The endurance performance of the capacitor shall meet the requirements of Table 3, insulation resistance R or self-discharge time constant RC
R≥1×103MQ
RC≥1x10° s
Table 3 Endurance of capacitors
Impulse voltage
Impulse current
Impulse voltage division
Oscillation circuit
Continuous pulse
DC high voltage
Rectification and filtering
Under rated voltage, charge and discharge according to specified waveform or circuit parameters. Withstand impulse wave of specified waveform with peak value equal to rated voltage. Under rated voltage, perform attenuated oscillation discharge according to specified attenuation rate. Under rated voltage, perform continuous charge and discharge according to specified waveform or circuit parameters. Continuous operation under rated voltage
Generally work under DC voltage with AC component superimposed. The peak value of pulse voltage shall not exceed rated voltage Un, and the amplitude value of AC component shall not exceed 0.15Un/50/f, where f is the frequency of the AC component in Hz
Note: If special capacitors are required, the purchaser shall negotiate and determine with the manufacturer. 6 Test method
Test conditions
Durability (not less than)Www.bzxZ.net
Charge and discharge 10000 times
Endure times 10000 times
Charge and discharge 10000 times
The number of charge and discharge times or the duration shall be determined by the purchaser and the manufacturer through consultation
Long-term intermittent operation (for example, 8h in every 24h), and the total number of operation cycles shall be determined by the purchaser and the manufacturer through consultation
JB/T8168-1999
All tests and measurements of capacitors, except where otherwise provided for in the relevant clauses of this standard, shall be carried out under the conditions of ambient air temperature of +5~+35℃ and relative humidity not exceeding 75%. If the measured data needs to be corrected, it shall be based on standard atmospheric conditions (temperature +20℃, pressure 101.3kPa, humidity 11g/m3). 6.2 Appearance and Dimension Inspection
Carry out according to the drawings and relevant documents of the manufacturer. 6.3 Sealing Test
Heat the capacitor until the temperature of each internal part reaches 55℃ and keep it for at least 2h. There should be no oil leakage. 6.4 Capacitance Measurement
Capacitance measurement should be carried out under AC voltage using a method that can eliminate errors caused by harmonics and accessories in the measurement circuit. The root mean square value of the measured voltage should not be greater than 0.1UN, and the measurement accuracy should not be less than 2%. 6.5 Withstand Voltage Test
The withstand voltage test shall be carried out in accordance with the relevant provisions in GB/T16927.1. After maintaining the test voltage for 1min, discharge through the discharge resistor specified by the manufacturer. During the test, check whether the capacitor is damaged based on the indication of the instrument, the discharge sound, observation of the capacitor or re-measurement of the capacitance. The capacitance value should be measured before and after the test, and the difference between the two measured values should be within the measurement error range. For capacitors with all components connected in parallel, if the internal fuse is blown and the capacitance value of the capacitor still meets the requirements of 5.2.5, it can be regarded as a qualified product. For outdoor capacitors required to be used under rain conditions, this test should be carried out under rain conditions during type testing. 6.65 Charge and discharge test
Start the capacitor from a value lower than or equal to 50% of the rated voltage, then charge it to the rated voltage at an appropriate speed, and then discharge it through a circuit with parameters specified by the manufacturer. The capacitance value should be measured before and after this test, and the difference between the two measured values should be within the measurement error range. For capacitors with all components connected in parallel, if the internal fuse is blown and the capacitance value of the capacitor still meets the requirements of 5.2.5, it can be regarded as a qualified product. 6.7 Measurement of loss tangent
The loss tangent value measurement should be carried out after the withstand voltage test, under 50Hz AC voltage, using a method that can eliminate errors caused by harmonics and accessories in the measurement circuit. The measured voltage root mean square value should not be greater than 0.1Un (but not less than 500V), and the measurement accuracy should not be less than 20%.
6.8 Insulation resistance or self-discharge time constant measurement Insulation resistance measurement is carried out by any of the following methods. The self-discharge time constant is equal to the product of the measured insulation resistance and the measured capacitance value. 6.8.1 Charge the capacitor to the rated voltage (0.8Un for the capacitor used for impulse voltage division), keep it for 1min, then cut off the power supply, let the capacitor self-discharge, measure the voltage after a period of time, and calculate the insulation resistance according to the following formula: R=c.ln(uo/u.)
Where: R—insulation resistance, Q;
C——capacitor measured capacitance, μF;
Uo——voltage at the beginning of self-discharge, kV; U—voltage after a self-discharge time t, kV; t——self-discharge time, s.
JB/T8168-1999
6.8.2 Apply rated voltage to the capacitor, maintain for 1 minute, and measure the voltage and leakage current of the capacitor. The insulation resistance is calculated according to the following formula: R:
Where: R—insulation resistance, Q;
U—DC voltage applied to a capacitor, kV; i—leakage current, mA.
6.8.3 Measure the insulation resistance with a high resistance meter with a relative error of no more than 10%. 6.9 Intrinsic inductance measurement
The inherent inductance measurement should be carried out by appropriately selecting one of the following methods or other effective methods based on the requirements of the inductance. Measures should be taken during measurement to minimize the additional inductance. 6.9.1 Use an oscilloscope to measure the discharge oscillation frequency and logarithmic attenuation rate of the capacitor, and calculate the inductance of the capacitor according to the following formula. L
Where: L
Cf2(4 yuan 2 +82
Capacitor’s inherent inductance, μH;
Additional inductance of external circuit, μH;
Measured capacitance of capacitor, μF;
Discharge oscillation frequency, Hz;
S——discharge logarithmic decay rate, 8=ln(U/U+T);U—voltage at discharge time t, kV;
voltage at discharge time t+T, kV, T=1/f. x1012-L'
6.9.2 Use the difference method (or series capacitor method) to measure the inherent inductance of the capacitor. Compare the measured capacitor A with the same type capacitor. Capacitor B is connected in series: when connected to the charging and discharging circuit, the inductance of the external circuit should be at the same order of magnitude as the inductance of the capacitor in series, and the additional inductance should be minimized. The discharge waveform should be recorded, and then the two terminals of the capacitor A under test should be short-circuited, and the discharge waveform should be measured again. The inherent inductance of the capacitor under test can be calculated by the following formula:
CA+CBT
4 yuan 2C
Where: L
capacitor inherent inductance, μH;
CA——capacitance of the capacitor under test, μF; CB-
capacitance of the capacitor in series, μF; | |tt||Discharge period when CA is short-circuited, S:
-discharge period when CA is connected in series with CB, S. TA+B——
6.9.3Measure the resonant frequency of the capacitor, and then calculate the inherent inductance of the capacitor as follows: 1
Where: L——capacitor inherent inductance, μH; C
Measured capacitance of the capacitor, μF
-resonant frequency, Hz.
4元2f,2c
....(4)
JB/T8168-1999
6.9.4 Use power frequency 50Hz and high frequency 105~10°Hz power supply to measure the capacitance of the capacitor, and calculate the inherent inductance of the capacitor according to the following formula: L
Where: L—inherent inductance of the capacitor, μH; fz——frequency of high frequency power supply, Hz;
4 yuan 2f,C2C
C2——capacitor capacitance measured by high frequency power supply, μFCi—capacitor capacitance measured by power frequency power supply, uF. 6.10 Durability test
6.10.1 Durability test of capacitors for impulse voltage, impulse current and oscillation circuits... (6)
Connect the capacitor to the discharge circuit under the working conditions specified in Table 3, apply pressure to the rated voltage uniformly, and charge and discharge the capacitor 10,000 times according to the charge and discharge time interval specified in the special technical conditions. The capacitance of the capacitor shall be measured before, during and after the test, and the difference in the measured capacitance value shall be within the measurement error range. 6.10.2 The test method for the durability test of capacitors for continuous pulse use shall be determined by the manufacturer and the purchaser through consultation. When formulating an agreement, in addition to specifying the test voltage and durability performance, attention shall be paid to negotiating the reverse peak voltage rate (or discharge attenuation rate), oscillation frequency or current peak value) and repetition rate of the capacitor discharge. If there is no relevant agreement, the test method shall be specified by the manufacturer.
6.10.3 The test method for the durability test of capacitors for impulse voltage division shall be determined by the manufacturer and the purchaser through consultation. If there is no relevant agreement, the test method shall be formulated by the manufacturer when the test is required. 6.10.4 The test method for the durability test of capacitors for DC high voltage and rectification and filtering shall be determined by the manufacturer and the purchaser through consultation. If there is no relevant agreement, the following tests are recommended for reference assessment. 6.10.4.1 Durability test of capacitors for DC high voltage: Apply DC voltage to the rated value for 24 hours. 6.10.4.2 Durability test of capacitors for rectifier and filter: Apply DC voltage to the rated value for the capacitor, and superimpose a 50Hz AC voltage with an amplitude of 20% of the rated voltage for 24 hours. The capacitance and loss tangent of the capacitor must be measured before, after and during the test. The difference between the measured capacitance and loss tangent should be within the measurement error range.
7 Inspection rules
Capacitor tests are divided into: factory test, type test and acceptance test. The test items are shown in Table 4. 7.1 Factory test
Factory test is carried out by the manufacturer on each capacitor produced. 7.2 Type test
Type test is carried out when a new product is manufactured, or when the material, structure or process of the product is changed during production, and the change may affect certain performance of the capacitor. For products that are regularly produced, even if there is no such change, the type test should be carried out every five years; for products that are not regularly produced, it should be carried out according to the purchaser's requirements. The capacitors for type test should be capacitors that have passed the factory test. 7.3 Acceptance test
Acceptance test is mainly a test that the purchaser needs to carry out when receiving the capacitor. The purpose of this test is to check whether the capacitor has been damaged during transportation6
JB/T 8168-1999
to ensure that the capacitor received is good. When conditions permit, the recommended test items are shown in Table 4. Table 4 Test items
8 Mark
Test category
Factory test
Type test
Acceptance test
Test items
Appearance and size inspection
Sealing test
Capacitance measurement
Withstand voltage test, dry test
5 times charge and discharge test
Loss tangent measurement
Insulation resistance or self-discharge time constant measurement
Withstand voltage test, wet test
Inherent inductance measurement
Durability test
Capacitance measurement
Withstand voltage test
Loss tangent measurement
Each capacitor should have a nameplate indicating the following: a) Name;
b) Model;
c) Rated voltage, kV;
d) Actual measured capacitance, μF;
Technical requirements
Requirement number
Test method
Legal number
Whether capacitors with large internal resistance should be subject to this test shall be determined by the manufacturer. Part of the capacitors in each batch can be selected for measurement. The number of units sampled for measurement shall not be less than 5% of the total number of capacitors in the batch, and the minimum number is 3. If there are unqualified ones in the sampled test, all capacitors in the batch shall be measured. The test voltage applied shall not exceed the rated voltage. e) Weight, kg (If it cannot be marked due to the size of the nameplate, it can be noted in the product instruction manual); f) Number;
g) Year and month of production;
h) Name of the manufacturer.
9 Safety requirements
Whether during the test or during use, before touching the capacitor, the capacitor must be reliably discharged with a grounding rod, and then the capacitor terminals must be short-circuited and grounded. After the capacitor test, the capacitor terminals and the casing (if it is a steel plate casing) must be short-circuited with bare copper wires. The short-circuit wire should be kept until it is removed when the purchaser uses it. People's Republic of China
Mechanical Industry Standard
Pulse capacitors and DC capacitors
JB/T8168—1999
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Print Sheet X/X Number of Words XXXXXX
Format 880×12301/16
Edition X, XX, 19XX
Number of Prints 1XXX
Printing X, XX, 19XX
Price XXX.XX Yuan
XX-XXX
Mechanical Industry Standard Service Network: http://www.JB.ac.cn6661-8918/f
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